In some embodiments, a computer-implemented method includes receiving a first location-based service request from a requesting device. Once the radiographic image source has been aligned with the aiming arm, the position of the aiming arm relative to an underlying implant can be visually inspected to determine whether the aiming arm is aligned with the underlying implant. Further, the operator can grasp the kind of image data and how the image data are processed and output as a single flow. If the ESM includes a capacitor back-up power source, it is charged by the main module and the capacitor charge is dissipated if the ESM is separated from the main module. A pawl extends from the end of the operative member.